The New York Times reports that Slack has filed paperwork for an initial public offering. Assuming everything goes well, you'll be able to buy shares of Slack relatively soon, and the Times points out that Slack's financials are already in a good place. A "person with knowledge of the details" told the Times that investment firms think Slack is worth about $13 billion dollars. They've raised hundreds of millions of dollars from investors these past few years, and the company allegedly made more than $350 million in revenue last year. Slack also plans an unusual form of public offering called a direct listing, the person added. Unlike most I.P.O.s, in which firms sell stock to public market investors in advance, direct listings let a company begin trading its shares on an exchange without raising new funds. Spotify, a provider of streaming music, went public in 2018 in a direct listing, paving the way for other high-profile start-ups to follow. With a direct listing, shareholders can also sell their stock immediately after the public offering, instead of waiting for what is known as a lockup period to expire.